mm.h revision 1.2.6.2
1 1.2.6.2 yamt /* $NetBSD: mm.h,v 1.2.6.2 2014/05/22 11:40:56 yamt Exp $ */ 2 1.2.6.2 yamt 3 1.2.6.2 yamt /*- 4 1.2.6.2 yamt * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.2.6.2 yamt * All rights reserved. 6 1.2.6.2 yamt * 7 1.2.6.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.6.2 yamt * by Taylor R. Campbell. 9 1.2.6.2 yamt * 10 1.2.6.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.2.6.2 yamt * modification, are permitted provided that the following conditions 12 1.2.6.2 yamt * are met: 13 1.2.6.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.2.6.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.2.6.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.6.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.2.6.2 yamt * documentation and/or other materials provided with the distribution. 18 1.2.6.2 yamt * 19 1.2.6.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.6.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.6.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.6.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.6.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.6.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.6.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.6.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.6.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.6.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.6.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.2.6.2 yamt */ 31 1.2.6.2 yamt 32 1.2.6.2 yamt #ifndef _LINUX_MM_H_ 33 1.2.6.2 yamt #define _LINUX_MM_H_ 34 1.2.6.2 yamt 35 1.2.6.2 yamt #include <sys/kauth.h> 36 1.2.6.2 yamt #include <sys/file.h> 37 1.2.6.2 yamt #include <sys/mman.h> 38 1.2.6.2 yamt #include <sys/proc.h> 39 1.2.6.2 yamt #include <sys/vnode.h> 40 1.2.6.2 yamt 41 1.2.6.2 yamt #include <uvm/uvm_extern.h> 42 1.2.6.2 yamt 43 1.2.6.2 yamt /* XXX Ugh bletch! Whattakludge! Linux's sense is reversed... */ 44 1.2.6.2 yamt #undef PAGE_MASK 45 1.2.6.2 yamt #define PAGE_MASK (~(PAGE_SIZE-1)) 46 1.2.6.2 yamt 47 1.2.6.2 yamt #define PAGE_ALIGN(x) (((x) + (PAGE_SIZE-1)) & ~(PAGE_SIZE-1)) 48 1.2.6.2 yamt #define offset_in_page(x) ((x) & (PAGE_SIZE-1)) 49 1.2.6.2 yamt 50 1.2.6.2 yamt /* 51 1.2.6.2 yamt * ################################################################### 52 1.2.6.2 yamt * ############### XXX THIS NEEDS SERIOUS SCRUTINY XXX ############### 53 1.2.6.2 yamt * ################################################################### 54 1.2.6.2 yamt */ 55 1.2.6.2 yamt 56 1.2.6.2 yamt /* 57 1.2.6.2 yamt * XXX unsigned long is a loser but will probably work accidentally. 58 1.2.6.2 yamt * XXX struct file might not map quite right between Linux and NetBSD. 59 1.2.6.2 yamt * XXX This is large enough it should take its own file. 60 1.2.6.2 yamt */ 61 1.2.6.2 yamt 62 1.2.6.2 yamt static inline unsigned long 63 1.2.6.2 yamt vm_mmap(struct file *file, unsigned long base, unsigned long size, 64 1.2.6.2 yamt unsigned long prot, unsigned long flags, unsigned long token) 65 1.2.6.2 yamt { 66 1.2.6.2 yamt struct vnode *vnode; 67 1.2.6.2 yamt vaddr_t addr; 68 1.2.6.2 yamt int error; 69 1.2.6.2 yamt 70 1.2.6.2 yamt /* 71 1.2.6.2 yamt * Cargo-culted from sys_mmap. Various conditions kasserted 72 1.2.6.2 yamt * rather than checked for expedience and safey. 73 1.2.6.2 yamt */ 74 1.2.6.2 yamt 75 1.2.6.2 yamt KASSERT(base == 0); 76 1.2.6.2 yamt KASSERT(prot == (PROT_READ | PROT_WRITE)); 77 1.2.6.2 yamt KASSERT(flags == MAP_SHARED); 78 1.2.6.2 yamt 79 1.2.6.2 yamt KASSERT(file->f_type == DTYPE_VNODE); 80 1.2.6.2 yamt vnode = file->f_data; 81 1.2.6.2 yamt 82 1.2.6.2 yamt KASSERT(vnode->v_type == VCHR); 83 1.2.6.2 yamt KASSERT((file->f_flag & (FREAD | FWRITE)) == (FREAD | FWRITE)); 84 1.2.6.2 yamt 85 1.2.6.2 yamt { 86 1.2.6.2 yamt struct vattr va; 87 1.2.6.2 yamt 88 1.2.6.2 yamt vn_lock(vnode, (LK_SHARED | LK_RETRY)); 89 1.2.6.2 yamt error = VOP_GETATTR(vnode, &va, kauth_cred_get()); 90 1.2.6.2 yamt VOP_UNLOCK(vnode); 91 1.2.6.2 yamt if (error) 92 1.2.6.2 yamt goto out; 93 1.2.6.2 yamt /* XXX kassert? */ 94 1.2.6.2 yamt if ((va.va_flags & (SF_SNAPSHOT | IMMUTABLE | APPEND)) != 0) { 95 1.2.6.2 yamt error = EACCES; 96 1.2.6.2 yamt goto out; 97 1.2.6.2 yamt } 98 1.2.6.2 yamt } 99 1.2.6.2 yamt 100 1.2.6.2 yamt /* XXX pax_mprotect? pax_aslr? */ 101 1.2.6.2 yamt 102 1.2.6.2 yamt addr = (*curproc->p_emul->e_vm_default_addr)(curproc, 103 1.2.6.2 yamt (vaddr_t)curproc->p_vmspace->vm_daddr, size); 104 1.2.6.2 yamt error = uvm_mmap(&curproc->p_vmspace->vm_map, &addr, size, 105 1.2.6.2 yamt (VM_PROT_READ | VM_PROT_WRITE), (VM_PROT_READ | VM_PROT_WRITE), 106 1.2.6.2 yamt MAP_SHARED, vnode, base, 107 1.2.6.2 yamt curproc->p_rlimit[RLIMIT_MEMLOCK].rlim_cur); 108 1.2.6.2 yamt if (error) 109 1.2.6.2 yamt goto out; 110 1.2.6.2 yamt 111 1.2.6.2 yamt KASSERT(addr <= -1024UL); /* XXX Kludgerosity! */ 112 1.2.6.2 yamt 113 1.2.6.2 yamt out: /* XXX errno NetBSD->Linux (kludgerific) */ 114 1.2.6.2 yamt return (error? (-error) : (unsigned long)addr); 115 1.2.6.2 yamt } 116 1.2.6.2 yamt 117 1.2.6.2 yamt #endif /* _LINUX_MM_H_ */ 118
Indexes created Thu Oct 02 14:10:14 GMT 2025